Drivescrew expansion and method



April 24, 1923. 1,667,268

H. W. PLEISTER DRIVE SCREW EXPANSION AND METHOD Filed M 11. 1926 2 Sheets-Sheet 1 jNVEN TOR.

ATTORNEY April 24, 1928. 7 1,667,268

- H. w. PLEISTER DRIVE SCREW EXPANSION AND METHOD Filed May 11. 1926 ZSheetsShaet 2 11 TTORNEY 25 may cooperate with long Patented Apr. 24, 1928.

I UNITED S A S HENRY W. rLnIs'rEmfor fwEsTFInLn, new JERSEY, nssienon, Y MEVSNE nssren- "Mnnrs, To HENRY B. NEWI IALi. oonronn'rion,

CORPORATION OF NEW JERSEY.

or GARWOOD, New JERSEY, A

DRIVESCREW XPANSION AND METHOD,

Application filed May 11,

My invention relates to expansions and more particularly to a drive screw expansion and the method ofm'aking it.

My-invention further relates to, an expansion shield} formed] by bending different strands of wire upon themselves, and then twisting the strands, to obtain cheap and simple expansion shield, and one which is adapted to be expanded by a drivescrew.

My invention further relates to certain methods, combinations, details of construction and articles of manufacture which will .be I more fully hereinafter described and I pointed outin the claims. Z

In the'accompanying drawing. the same reference numerals refer to similar parts in the several figures, a a

Fig. 1 is a perspective view of. alength of Wire bent back upon itself, showing the first 20 stage of manufacturing my wire shield;

Fig. 2 isa perspective view of the completed wire shield formed by bending the double wire shown in, Fig. 1 upon itself, and

, also twisting the strands of wire so thatthey 1 pitch spiral threads ofadrive'screw; i l

Fig. 3 is'a front elevation of the 6X1)t11' sion shield, Y Y

d Fig. 1 is a side elevation;

Fig. 5 is a plan view of the shown in Fig. 2" e Fig. 6 is a perspective view of one form' of drive screw, which I may employ asthe expanding member;

Fig. 7 is a transverse, vertical section, on the line 77 of Fig. 6; 7

. Fig. Sis a plan view of the combined wire expansion shield and the drive screw with which it cooperates, the same being shown in the shipping position of the parts;

Fig, 9 is a vertical section showing the wire shield mounted. in a wall, or other suitable support, and about to be expanded by.

v the drive screw;

Fig. 10 is a horizontal section on the linev 10-10 of Fig. 9, looking np-in the direction of the arrows, and on'iitting the drive screw;

Fig. 11 is a vertical section similar to Fig. 9 showing the beginning of the initial radial expansion upon the insertion of the drive screw;

Fig. 12 is a horizontal section on the line 1212 of Fig. 11, looking up in the direction of the arrows, the drive screw being 30 wire shield 1926. Serial No. 108,280.

omitted forpurposeslof clearer illustration? Fig.1?) is a vertical section similar: to

' Fig. 11, showingthedrive screwdriven' home;- i

Fig;.-1 1 is a horizontalsection on the line I l- 14 ofFig. 13, .the; drive screw being PATENT .OrrrCs.

omitted for purposes of clearer illustration;

Fig. 15 isa'detail of a blankfrom which, one form of mydrivescrew may be made;

Fig. 16 is a detailshowing one form of my drive screw .made from. the blank of Fig. 15 by twisting the bar to formlong pitch spiral threads, then npsetting one end. to form a head, and sharpening the other end to form a drive point; 9 T

Fig. 17 is a detail of a modification in which the drive screw may betapered.

In, my invention a cheap grade of comparatively soft wire 1, cutto' the particular length desired, for any particular, size shield,is bent back upon itself, asshown in Fig. 1, to form two strands. This double strand of wire is bent, substantially between its ends, so that the wireshield 2' (Fig. 2) is formed having strands 3, 4 5, 6. i The ends of the strands 3 and 6 are bent to formthe portion 7, which is a part of the integral head of the wireshield. heends ofuthe strands 4 and 5 arethen, bent at right angles to form the; portions 8, 8.. Theseportions 8, 8 and the portions 7 form the integral head of a wire shield... The strands3, 4, 5 and 6 are then twisted as shown more clearly in Figs. 5 and 8, to permit them to co operate with the long pitch spiral-threads 9, 9 of the drive screw 10. This drive screw is provided with a head 11 and a point 12.

A hole 13 of the required size is drilled, or otherwise formed, in the wall 12 of brick, masonry, concrete, stone or other suitable material, and into this hole is placed the wire shield 2, first passing it through a hole 14 in the bracket 15, or other work to be supported, on the face 16 of the wall or other suitable support 112. "The drive screw 10 is then brought into the position shown in Fig. 9 and partially inserted into the axial bore 17 "of the shield (Fig. 11). This causes the first or primary radial expansion, due to forcing the strands 4 and 5 away from the strands 3 and 6. When the point 12- of the drive screw is driven further into the expansion shieldQ and contacts with the bent portions 20 and 21, it will spread these portions apart and give them a secondary axis of the hole 13, but on the contrary, are Thls gives an IDCIQZISQd at an angle to it.

bearing or bond between the shield '2 and the Wall of thehole 18-, because any excessive strain or pull upon the work or bracket 15" is resisted by the peculiar helical or helicoldal position of these strands, which prevents on an excessive lull or strain an 7 g L v 7 po-rtlon of a strand tracking the preced ing portion of that strand. That is, they are not in' line and any-excessive; strain or pull, sufiicient to withdraw the shield, will cause the helical or helicoidally arranged strands 3, 4, 5 and 6 to scrape or, chip the entire interior surface of the wall 18 and not' inerely portions of the surface of the hole, as would be the case itthe strands were parallel to the longitudinal axis of the hole;

I may use various forms of drive screws instead of the form shown in Figs, 6, 8, 9, 11 and 13. F or example, I may use a drive screw 25 formed from a blank of angular stock, such for example as square stock (Fig. 15), having corners 27, 27. This blank can then be twisted, in any suitable manner, in a machine, the corners 27, 27 after twisting becoming the long pitch spiral threads 12?, 12? of the drivescrew 25 (Fig. '16). It is,

of course, understood that one end of the blank 26 is upset to form a head 28, and that the other end sharpened to form a drive point 29-.

I may also use tapered drive screw 30, as shown in Fig. 17, havlng a head '31 and.

drive point 32 and provided with spiral threads 33', 33. i

It will be noted that my PXPzlllslOD; shield,

parts to be assembled and; consequently no parts to be lost, and no time is consumed in assembling. It is further to be noted that my wire shieldis an open construction.

which will freely allow galvanizing by the thereof, to the details o't'which l do not desire to be limited, what is claimed as new. and what is desired to secure by Letters Patent is set forth in-the appended claims,

W'hat I claim is 1. The method of manufacturing arwire nail expansion consisting in. bending: a

strand of wire back on itself to form. a twov strand" wire, then-bending and twisting. the two strand wire on itself to form a fourstrand expansible' shield, the strands of which are in a position to cooperate with long pitch spiral thread of a drive screw.

2; The method of manufacturing a wire nail expansion consisting inbending a strand of wire back on itself to form a two strand wire, then bending and twisting the two strand wire on itself to form a four strand expansible shield, the strands of which are in a position. to cooperatewith long pitch spiral threads of, a drivescrew and bending the ends of the double wire to form a head for the wire shield;

3. A newarticle of manufacturecomprising an integral wire expanslon SlllGlClfOllllBtl of wire bent back on itselftwice and twisted to form four integral hehcoidal extending strands of wire and an integralwire head formed in two parts. i

4. A new article of manufacture comprising an integral wire expansion shield formed of wire bent back on itself twice and twisted to form four integral helicoidal extending strands of wire and an integral wire head formed in two parts and a long pitch spiral threaded drivescrew nested in the integral wire shield.

HENRY V, PLEISTER; 

